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<p class="MsoNormal"><span style="color:#1F497D">></span>On Aug 16, 2012, at 1:09 PM, "Rao, Prashantha" <<a href="mailto:Prashantha.Rao@amd.com">Prashantha.Rao@amd.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hi-<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I am writing a pass to traverse loops and collect some analysis data and later on
come back to transform the IR. In the analysis phase I need to <span style="color:#1F497D">
></span>remember statistics regarding every loop in the program. What is the best way to uniquely remember a loop?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">></span>Probably too late to help you but... loops are identified by their header block. Depending on your situation you might directly
<span style="color:#1F497D">></span>point to the block or refer to its name. If you need to be more robust across CFG optimization and inlining, you'll have to use
<span style="color:#1F497D">></span>debug info instead.<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">></span>-Andy<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">More than one loop may share the same header; I can certainly run LoopSimplify as a prepass. But will that ensure unique loop header for each loop. As I will
be performing transformation after the analysis other optimizations will not interfere (hopefully).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Will the debug info metadata be available always? If so, what are good pointers to explore?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Prashantha<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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